Docker provides official images for popular languages and services that are aimed to work in common context, whether in development or in production. CircleCI highly recommends using them for creating custom images that are more appropriate for users.

However, we frequently found them lacking some tools making them appropriate for dev/CI use. CircleCI publishes this image to extend the images in the following ways:

Common tools used in development and CI are installed e.g. git, ssh, tar, ca-certificates, curl, wget.